Filefield : Cancel ajax tranfer upload

Hello all

I am using filefields in my content types for big files (videos mainly, using Media_Mover then) + uploadprogress module to display the % and estimated remaining time.

Is it possible to add a cancel button to allow users to cancel uploads during the upload rather than waiting for the upload to finish then deleting?

I tried window.stop(); but didn't work out

Any clue?